If you are a programmer, you need this book.

You've got a day to add a new feature in a 34,000-line program: Where do you start? Page 333
How can you understand and simplify an inscrutable piece of code? Page 39
Where do you start when disentangling a complicated build process? Page 167
How do you comprehend code that appears to be doing five things in parallel? Page 132
You may read code because you have to — to fix it, inspect it, or improve it. You may read code the way an engineer examines a machine — to discover what makes it tick. Or you may read code because you are scavenging — looking for material to reuse.

Code-reading requires its own set of skills, and the ability to determine which technique you use when is crucial. In this indispensable book, Diomidis Spinellis uses more than 600 real-world examples to show you how to identify good (and bad) code: how to read it, what to look for, and how to use this knowledge to improve your own code.

Fact: If you make a habit of reading good code, you will write better code yourself.